/*===========================================================================
 
 Copyright (C) 1995-2012 Yves Renard
 
 This file is a part of GETFEM++
 
 Getfem++  is  free software;  you  can  redistribute  it  and/or modify it
 under  the  terms  of the  GNU  Lesser General Public License as published
 by  the  Free Software Foundation;  either version 3 of the License,  or
 (at your option) any later version along with the GCC Runtime Library
 Exception either version 3.1 or (at your option) any later version.
 This program  is  distributed  in  the  hope  that it will be useful,  but
 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 or  FITNESS  FOR  A PARTICULAR PURPOSE.  See the GNU Lesser General Public
 License and GCC Runtime Library Exception for more details.
 You  should  have received a copy of the GNU Lesser General Public License
 along  with  this program;  if not, write to the Free Software Foundation,
 Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA.
 
===========================================================================*/

#include "getfem/dal_backtrace.h"
#ifdef GETFEM_HAVE_BACKTRACE
# include <execinfo.h>
#endif
#ifdef GETFEM_HAVE_CXXABI_H
# include <cxxabi.h>
#endif
namespace dal {
  /* demangles a c++ mangled function name, such as the ones
     returned by backtrace_symbols or typeid(x).name()
     If you call this function with a non-mangled name (i.e. "main"),
     you will get strange results.
   */
  std::string demangle(const char *
#ifdef GETFEM_HAVE_CXXABI_H
		       s
#endif
		       ) {
#ifdef GETFEM_HAVE_CXXABI_H
    int status;
    /* documented in http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/namespaceabi.html */
    char *sd = abi::__cxa_demangle(s, NULL, NULL, &status);
    if (sd == NULL || status) {
      if (sd) free(sd);
      return std::string(""); // + " [could not be demangled]";
    } else {
      std::string res(sd); free(sd); return res;
    }
#else
    return std::string("");
#endif
  }

#ifdef GETFEM_HAVE_BACKTRACE
  void dump_glibc_backtrace() {
    static int cnt = 0;
    int i,n;
    void* trace[256];
    char** strings;
    if (cnt++ == 0) {
      n = backtrace(trace, 256);
      strings = backtrace_symbols (trace, n);
      if (strings == NULL) {
	fprintf(stderr, "backtrace unavailable ... no more memory ?\n"); return;
      }
      fprintf(stderr,"Backtrace dump follows:\n");
      for (i = 0; i < n; ++i) {
	char s[256]; strncpy(s,strings[i],256);s[255]=0;
	char *a = strchr(s,'('), *b = 0;
	if (a) b = strchr(a,'+');
	if (!a || !b) {
	  fprintf(stderr,"%2d : %s\n", i, s);
	} else {
	  *a = 0; *b = 0;
	  fprintf(stderr,"%2d : %s(%s+%s  %s\n",
		  i, s, a+1, b+1, demangle(a+1).c_str());
	}
      }
      free (strings);
      cnt--;
    } else { /* on n'est jamais trop prudent */
      fprintf(stderr, "ooops, a recursive bug in dump_glibc_backtrace\n");
    }
  }
#endif
}
